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stripe length
The number of bytes that must be written to span all the physical storage
media (physical volumes) that are grouped together to form the logical storage
media (virtual volume). The stripe length equals the virtual volume block size
multiplied by the number of physical volumes in the stripe group (i.e., stripe
width).
stripe width
The number of physical volumes grouped together to represent a virtual
volume.
System Manager
The Storage System Management (SSM) server. It communicates with all
other HPSS components requiring monitoring or control. It also
communicates with the SSM graphical user interface (hpssgui) and command
line interface (hpssadm).
TB
Terabyte (2
40
)
TCP/IP
Transmission Control Protocol/Internet Protocol
trace
A log record message type used to record entry/exit processing paths through
HPSS server software.
transaction
A programming construct that enables multiple data operations to possess the
following properties:
All operations commit or abort/roll-back together such that they form a single
unit of work.
All data modified as part of the same transaction are guaranteed to maintain a
consistent state whether the transaction is aborted or committed.
Data modified from one transaction are isolated from other transactions until
the transaction is either committed or aborted.
Once the transaction commits, all changes to data are guaranteed to be
permanent.
TTY
Teletypewriter
UDP
User Datagram Protocol
UID
User Identifier
UPC
Universal Product Code
UUID
Universal Unique Identifier
virtual volume
An HPSS object managed by the Core Server that is used to represent logical
media. A virtual volume is made up of a group of physical storage media (a
stripe group of physical volumes).
virtual volume block size
The size of the block of data bytes that is written to each physical volume of a
striped virtual volume before switching to the next physical volume.
VV
Virtual Volume
XDSM
The Open Group’s Data Storage Management standard. It defines APIs that
use events to notify Data Management applications about operations on files.
XFS
A file system created by SGI available as open source for the Linux operating
system.
HPSS Installation Guide July 2008
Release 6.2 (Revision 2.0) 254